Mailing List flyrotary@lancaironline.net Message #58118
From: Ernest Christley <echristley@att.net>
Subject: Graduated to high power run-ups
Date: Wed, 23 May 2012 00:06:01 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Today I ran a while to let the computer tune the engine.  With the brakes set, I averaged probably about 4gph for the first half and 1.5gph on the second half of the 12 minute run.  I finally had to stop when the water hit 200*.  The oil hit 175* after 9 minutes and only got up to 181* by the end.

I then did some wide open throttle runs.  The computer was all over the place in this area, becuse I've done practically no tuning runs there.  So, these runs were to get data on where the engine wants to be as much as it was about listening to the engine scream.  Its hard to pick meaningful data, because the computer has the engine jumping around, but a few samples:

TP   RPM    AFR   GPH   ADV
62   5043   11.5  18.11 22.2
73   4579   11.9  19.52 20.1
50   5014   15.1  14.75 23.4

I'm definitely making good power, evidenced by the curtsy the nose does when I power up.  Anyone care to guesstimate how much?

I don't think 12 minutes of ground running before hitting 203 is that bad(?).  The last 8* took 2 minutes.  The graph was fairly flat at that point.  If I raised my water temp redline to 210*,  I'd probably not ever hit it.  OAT was about 80* today.

At this point, I think my goal is to see how far I can lean out the low end,  while working to smooth out and then increase power on the top end.  I also think a lot of the timing could use more advance.  

Comments? Advice?



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